Yesterday I have experienced a really weird behaviour of my M2P.
First it refused to go above 30 ft, as if in the beginner mode (I checked, it was NOT in it).
Then during the landing it did not recognized the ground and pretty much plunged itself into concrete (hopefully nothing damaged).
After the restart of both the aircraft and controller it operated normally as if nothing happened.
This never happened to me before.
Anybody experienced something like this?

To state the obvious, it was in GPS mode, no errors, warnings.

Have you checked the flight log to see if there's a clue in there?   http://phantomhelp.com/logviewer/

2 possibilities:
1. Strong Magnetic interference. If 2nd takeoff from same position, discount this.
2. Possible temporary GPS disruption. Possibly caused by atmospheric anomaly.

Marty Markoe Posted at 1-17 06:19
2 possibilities:
1. Strong Magnetic interference. If 2nd takeoff from same position, discount this.
2. Possible temporary GPS disruption. Possibly caused by atmospheric anomaly.

Most likely first. I was in the rush to show off, and started on a hood of a car, which usually is a source of magnetic interference.

DAFlys Posted at 1-17 01:42
Have you checked the flight log to see if there's a clue in there?   http://phantomhelp.com/logviewer/

Not yet, I will try

Marty Markoe Posted at 1-17 06:19
2 possibilities:
1. Strong Magnetic interference. If 2nd takeoff from same position, discount this.
2. Possible temporary GPS disruption. Possibly caused by atmospheric anomaly.

Neither of those would have the effect the OP described.
The most likely explanation would be flying without good GPS over a surface or in lighting conditions that was unsuitable for VPS sensors.
If he gets around to posting flight data, that will confirm it.